:root {
  --bg: #F5F6F5;
  --surface: #FFFFFF;
  --surface-2: #EEF1EE;
  --border: #DCE2DC;
  --text: #1B221D;
  --text-muted: #566058;
  --text-faint: #8A938B;

  --brand: #0F3D2E;
  --brand-ink: #0A2A20;

  --success: #2E8B57;
  --success-bg: #E8F5EC;
  --success-border: #BFE3CC;

  --error: #B0472F;
  --error-bg: #FBECE8;
  --error-border: #EAC3BA;

  --radius: 10px;
  --shadow: 0 1px 2px rgba(20, 24, 30, 0.06), 0 4px 14px rgba(20, 24, 30, 0.05);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0B0F0D;
    --surface: #141A16;
    --surface-2: #1B231E;
    --border: #2A342C;
    --text: #E7EDE8;
    --text-muted: #9BAA9E;
    --text-faint: #5C6960;

    --brand: #4FCB9A;
    --brand-ink: #E7EDE8;

    --success: #5FBE83;
    --success-bg: #132419;
    --success-border: #244A38;

    --error: #E28166;
    --error-bg: #2B1712;
    --error-border: #4C2A20;

    --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 8px 24px rgba(0, 0, 0, 0.35);
  }
}

* { box-sizing: border-box; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, "Segoe UI", Roboto, sans-serif;
  margin: 0;
  padding: 40px 20px;
  display: flex;
  justify-content: center;
}

.page {
  width: 100%;
  max-width: 560px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.site-header {
  display: flex;
  align-items: center;
}
.site-header .brand {
  font-weight: 700;
  font-size: 15px;
  letter-spacing: 0.02em;
  color: var(--brand);
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 28px 26px;
}

h1 {
  font-size: 22px;
  font-weight: 700;
  margin: 0 0 10px;
  letter-spacing: -0.01em;
}

h2 {
  font-size: 14px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-muted);
  margin: 0 0 10px;
}

p {
  font-size: 14.5px;
  line-height: 1.6;
  color: var(--text-muted);
  margin: 0 0 14px;
}

p.lede {
  color: var(--text);
  font-size: 15.5px;
}

a { color: var(--brand); }

code {
  font-family: ui-monospace, "SF Mono", Menlo, monospace;
  background: var(--surface-2);
  border: 1px solid var(--border);
  padding: 1px 6px;
  border-radius: 5px;
  font-size: 13px;
}

.instructions {
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 20px;
  margin-bottom: 20px;
}
.instructions ol {
  margin: 0 0 10px;
  padding-left: 20px;
  color: var(--text-muted);
  font-size: 14px;
  line-height: 1.7;
}
.instructions li { margin-bottom: 4px; }
.instructions p { margin-bottom: 0; font-size: 13.5px; }

form {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

label {
  font-size: 12.5px;
  font-weight: 600;
  color: var(--text);
  margin-top: 14px;
}
label .optional {
  font-weight: 400;
  color: var(--text-faint);
}

input[type="text"] {
  font-size: 14.5px;
  font-family: inherit;
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 12px;
  margin-top: 4px;
}
input[type="text"]:focus {
  outline: 2px solid var(--brand);
  outline-offset: 1px;
}

.field-hint {
  font-size: 12px;
  color: var(--text-faint);
  margin: 4px 0 0;
}

.field-error {
  font-size: 12px;
  color: var(--error);
  margin: 4px 0 0;
  font-weight: 600;
}

button {
  font-family: inherit;
  font-size: 14.5px;
  font-weight: 600;
  color: #fff;
  background: var(--brand);
  border: none;
  border-radius: 8px;
  padding: 12px 18px;
  margin-top: 22px;
  cursor: pointer;
}
button:hover { opacity: 0.92; }

.alert {
  border-radius: var(--radius);
  padding: 14px 16px;
  font-size: 14px;
  margin-bottom: 18px;
}
.alert-success {
  background: var(--success-bg);
  border: 1px solid var(--success-border);
  color: var(--text);
}
.alert-error {
  background: var(--error-bg);
  border: 1px solid var(--error-border);
  color: var(--text);
}
.alert p { margin-bottom: 8px; color: var(--text); }
.alert p:last-child { margin-bottom: 0; }

.invite-link code {
  display: block;
  word-break: break-all;
  padding: 10px 12px;
  font-size: 13px;
}

.site-footer {
  text-align: center;
  font-size: 12px;
  color: var(--text-faint);
}